Amd common merge 161031

cmake/modules/CheckCompilerVersion.cmake

@@ -8,8 +8,9 @@ if(NOT DEFINED LLVM_COMPILER_CHECKED)
 
   if(NOT LLVM_FORCE_USE_OLD_TOOLCHAIN)
     if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
-      if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.8)
-        message(FATAL_ERROR "Host GCC version must be at least 4.8!")
+      # FIXME: Change this to 4.8 once documentation builder bot is upgraded
+      if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.7)
+        message(FATAL_ERROR "Host GCC version must be at least 4.7!")
       endif()
     elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
       if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.1)
@@ -35,7 +36,8 @@ std::atomic<float> x(0.0f);
 int main() { return (float)x; }"
           LLVM_NO_OLD_LIBSTDCXX)
         if(NOT LLVM_NO_OLD_LIBSTDCXX)
-          message(FATAL_ERROR "Host Clang must be able to find libstdc++4.8 or newer!")
+          # FIXME: Change this to 4.8 once documentation builder bot is upgraded
+          message(FATAL_ERROR "Host Clang must be able to find libstdc++4.7 or newer!")
         endif()
         set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
         set(CMAKE_REQUIRED_LIBRARIES ${OLD_CMAKE_REQUIRED_LIBRARIES})

cmake/modules/HandleLLVMOptions.cmake

@@ -647,6 +647,11 @@ string(TOUPPER "${LLVM_ENABLE_LTO}" uppercase_LLVM_ENABLE_LTO)
 if(uppercase_LLVM_ENABLE_LTO STREQUAL "THIN")
   append("-flto=thin" CMAKE_CXX_FLAGS CMAKE_C_FLAGS
                       CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
+  # On darwin, enable the lto cache. This improves initial build time a little
+  # since we re-link a lot of the same objects, and significantly improves
+  # incremental build time.
+  append_if(APPLE "-Wl,-cache_path_lto,${PROJECT_BINARY_DIR}/lto.cache"
+            CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
 elseif(uppercase_LLVM_ENABLE_LTO STREQUAL "FULL")
   append("-flto=full" CMAKE_CXX_FLAGS CMAKE_C_FLAGS
                  CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)

docs/LibFuzzer.rst

@@ -80,7 +80,9 @@ Some important things to remember about fuzz targets:
 * The fuzzing engine will execute the fuzz target many times with different inputs in the same process.
 * It must tolerate any kind of input (empty, huge, malformed, etc).
 * It must not `exit()` on any input.
-* It may use multiple threads but ideally all threads should be joined at the end of the function.
+* It may use threads but ideally all threads should be joined at the end of the function.
+* It must be as deterministic as possible. Non-determinism (e.g. random decisions not based on the input byte) will make fuzzing inefficient.
+* It must be fast. Try avoiding cubic or greater complexity.
 * Ideally, it should not modify any global state (although that's not strict).
 
 
@@ -759,6 +761,8 @@ Trophies
 
 * Tensorflow: `[1] <https://github.com/tensorflow/tensorflow/commit/7231d01fcb2cd9ef9ffbfea03b724892c8a4026e>`__
 
+* Ffmpeg: `[1] <https://github.com/FFmpeg/FFmpeg/commit/c92f55847a3d9cd12db60bfcd0831ff7f089c37c>`__  `[2] <https://github.com/FFmpeg/FFmpeg/commit/25ab1a65f3acb5ec67b53fb7a2463a7368f1ad16>`__  `[3] <https://github.com/FFmpeg/FFmpeg/commit/85d23e5cbc9ad6835eef870a5b4247de78febe56>`__
+
 .. _pcre2: http://www.pcre.org/
 .. _AFL: http://lcamtuf.coredump.cx/afl/
 .. _Radamsa: https://github.com/aoh/radamsa

include/llvm/ADT/APFloat.h

@@ -712,7 +712,7 @@ class APFloat : public APFloatBase {
         Double = std::move(RHS.Double);
       } else if (this != &RHS) {
         this->~Storage();
-        new (this) Storage(RHS);
+        new (this) Storage(std::move(RHS));
       }
       return *this;
     }
@@ -777,6 +777,7 @@ class APFloat : public APFloatBase {
   APFloat(const fltSemantics &Semantics) : U(Semantics) {}
   APFloat(const fltSemantics &Semantics, StringRef S);
   APFloat(const fltSemantics &Semantics, integerPart I) : U(Semantics, I) {}
+  // TODO: Remove this constructor. This isn't faster than the first one.
   APFloat(const fltSemantics &Semantics, uninitializedTag)
       : U(Semantics, uninitialized) {}
   APFloat(const fltSemantics &Semantics, const APInt &I) : U(Semantics, I) {}

include/llvm/Analysis/ModuleSummaryAnalysis.h

@@ -70,11 +70,6 @@ class ModuleSummaryIndexWrapperPass : public ModulePass {
 // object for the module, to be written to bitcode or LLVM assembly.
 //
 ModulePass *createModuleSummaryIndexWrapperPass();
-
-/// Returns true if \p M is eligible for ThinLTO promotion.
-///
-/// Currently we check if it has any any InlineASM that uses an internal symbol.
-bool moduleCanBeRenamedForThinLTO(const Module &M);
 }
 
 #endif

include/llvm/CodeGen/MachineRegisterInfo.h

@@ -553,7 +553,7 @@ class MachineRegisterInfo {
   /// isConstantPhysReg - Returns true if PhysReg is unallocatable and constant
   /// throughout the function.  It is safe to move instructions that read such
   /// a physreg.
-  bool isConstantPhysReg(unsigned PhysReg, const MachineFunction &MF) const;
+  bool isConstantPhysReg(unsigned PhysReg) const;
 
   /// Get an iterator over the pressure sets affected by the given physical or
   /// virtual register. If RegUnit is physical, it must be a register unit (from

include/llvm/CodeGen/SelectionDAG.h

@@ -1256,12 +1256,22 @@ class SelectionDAG {
     const;
 
   /// Determine which bits of Op are known to be either zero or one and return
-  /// them in the KnownZero/KnownOne bitsets.  Targets can implement the
-  /// computeKnownBitsForTargetNode method in the TargetLowering class to allow
-  /// target nodes to be understood.
+  /// them in the KnownZero/KnownOne bitsets. For vectors, the known bits are
+  /// those that are shared by every vector element.
+  /// Targets can implement the computeKnownBitsForTargetNode method in the
+  /// TargetLowering class to allow target nodes to be understood.
   void computeKnownBits(SDValue Op, APInt &KnownZero, APInt &KnownOne,
                         unsigned Depth = 0) const;
 
+  /// Determine which bits of Op are known to be either zero or one and return
+  /// them in the KnownZero/KnownOne bitsets. The DemandedElts argument allows
+  /// us to only collect the known bits that are shared by the requested vector
+  /// elements.
+  /// Targets can implement the computeKnownBitsForTargetNode method in the
+  /// TargetLowering class to allow target nodes to be understood.
+  void computeKnownBits(SDValue Op, APInt &KnownZero, APInt &KnownOne,
+                        const APInt &DemandedElts, unsigned Depth = 0) const;
+
   /// Test if the given value is known to have exactly one bit set. This differs
   /// from computeKnownBits in that it doesn't necessarily determine which bit
   /// is set.

include/llvm/DebugInfo/PDB/Raw/DbiStreamBuilder.h

@@ -70,6 +70,7 @@ class DbiStreamBuilder {
   uint32_t calculateModiSubstreamSize() const;
   uint32_t calculateFileInfoSubstreamSize() const;
   uint32_t calculateNamesBufferSize() const;
+  uint32_t calculateDbgStreamsSize() const;
 
   Error generateModiSubstream();
   Error generateFileInfoSubstream();

include/llvm/IR/IntrinsicsPowerPC.td

@@ -360,6 +360,17 @@ let TargetPrefix = "ppc" in {  // All intrinsics start with "llvm.ppc.".
   def int_ppc_altivec_vcmpnezb_p : GCCBuiltin<"__builtin_altivec_vcmpnezb_p">,
               Intrinsic<[llvm_i32_ty],[llvm_i32_ty,llvm_v16i8_ty,llvm_v16i8_ty],
                         [IntrNoMem]>;
+  def int_ppc_altivec_vclzlsbb : GCCBuiltin<"__builtin_altivec_vclzlsbb">,
+              Intrinsic<[llvm_i32_ty],[llvm_v16i8_ty],[IntrNoMem]>;
+  def int_ppc_altivec_vctzlsbb : GCCBuiltin<"__builtin_altivec_vctzlsbb">,
+              Intrinsic<[llvm_i32_ty],[llvm_v16i8_ty],[IntrNoMem]>;
+  def int_ppc_altivec_vprtybw : GCCBuiltin<"__builtin_altivec_vprtybw">,
+              Intrinsic<[llvm_v4i32_ty],[llvm_v4i32_ty],[IntrNoMem]>;
+  def int_ppc_altivec_vprtybd : GCCBuiltin<"__builtin_altivec_vprtybd">,
+              Intrinsic<[llvm_v2i64_ty],[llvm_v2i64_ty],[IntrNoMem]>;
+  def int_ppc_altivec_vprtybq : GCCBuiltin<"__builtin_altivec_vprtybq">,
+              Intrinsic<[llvm_v1i128_ty],[llvm_v1i128_ty],[IntrNoMem]>;
+
 }
 
 // Vector average.

include/llvm/IR/ModuleSummaryIndex.h

@@ -194,6 +194,10 @@ class GlobalValueSummary {
   /// possibly referenced from inline assembly, etc).
   bool noRename() const { return Flags.NoRename; }
 
+  /// Flag that this global value cannot be renamed (in a specific section,
+  /// possibly referenced from inline assembly, etc).
+  void setNoRename() { Flags.NoRename = true; }
+
   /// Record a reference from this global value to the global value identified
   /// by \p RefGUID.
   void addRefEdge(GlobalValue::GUID RefGUID) { RefEdgeList.push_back(RefGUID); }

include/llvm/Object/ELFObjectFile.h

@@ -59,6 +59,7 @@ class ELFObjectFileBase : public ObjectFile {
 
   virtual uint32_t getSectionType(DataRefImpl Sec) const = 0;
   virtual uint64_t getSectionFlags(DataRefImpl Sec) const = 0;
+  virtual uint64_t getSectionOffset(DataRefImpl Sec) const = 0;
 
   virtual ErrorOr<int64_t> getRelocationAddend(DataRefImpl Rel) const = 0;
 
@@ -90,6 +91,10 @@ class ELFSectionRef : public SectionRef {
   uint64_t getFlags() const {
     return getObject()->getSectionFlags(getRawDataRefImpl());
   }
+
+  uint64_t getOffset() const {
+    return getObject()->getSectionOffset(getRawDataRefImpl());
+  }
 };
 
 class elf_section_iterator : public section_iterator {
@@ -245,6 +250,7 @@ template <class ELFT> class ELFObjectFile : public ELFObjectFileBase {
 
   uint32_t getSectionType(DataRefImpl Sec) const override;
   uint64_t getSectionFlags(DataRefImpl Sec) const override;
+  uint64_t getSectionOffset(DataRefImpl Sec) const override;
   StringRef getRelocationTypeName(uint32_t Type) const;
 
   /// \brief Get the relocation section that contains \a Rel.
@@ -380,6 +386,11 @@ uint32_t ELFObjectFile<ELFT>::getSectionType(DataRefImpl Sec) const {
   return getSection(Sec)->sh_type;
 }
 
+template <class ELFT>
+uint64_t ELFObjectFile<ELFT>::getSectionOffset(DataRefImpl Sec) const {
+  return getSection(Sec)->sh_offset;
+}
+
 template <class ELFT>
 uint64_t ELFObjectFile<ELFT>::getSymbolValueImpl(DataRefImpl Symb) const {
   const Elf_Sym *ESym = getSymbol(Symb);